Seals

Product Details

O-ring O-ring is a rubber sealing ring with a circular cross-section. Because its cross-section is O-shaped, it is called an O-ring rubber seal, also called an O-ring. It began to appear in the mid-19th century, when it was used as a sealing element for steam engine cylinders.

　　Because it is cheap, simple to manufacture, has functions that cannot be underestimated, and has simple installation requirements, O-rings are a more common mechanical design for sealing. O-rings withstand tens of megapascals (thousands of pounds) of pressure. O-rings can be used in static applications or in dynamic applications where there is relative motion between components, such as the shaft of a rotary pump and the piston of a hydraulic cylinder.

　　O-ring application scope

　　O-ring sealing rings are suitable for installation on various types of mechanical equipment. They function as seals in static or moving conditions under specified temperatures, pressures, and different liquid and gas media. Various types of seals are widely used in machine tools, ships, automobiles, aerospace equipment, metallurgical machinery, chemical machinery, engineering machinery, construction machinery, mining machinery, petroleum machinery, plastic machinery, agricultural machinery, and various instruments and meters. element. O-rings are mainly used for static sealing and reciprocating sealing. When used for rotary motion sealing, it is only suitable for low-speed rotary sealing devices. O-rings are generally installed in grooves with a rectangular cross-section on the outer or inner circle to seal. The O-ring seal still plays a good sealing and shock-absorbing role in environments such as oil, acid, alkali, abrasion, and chemical erosion. Therefore, the O-ring is a widely used seal in hydraulic and pneumatic transmission systems.

　　O-rings are classified according to material

　　Natural rubber N R

　　(Natural Rubber) is made from latex collected from rubber trees and is a polymer of isoprene. It has good wear resistance, high elasticity, tear strength and elongation. It is easy to age in the air, becomes sticky when exposed to heat, easily expands and dissolves in mineral oil or gasoline, and is resistant to alkali but not strong acid. · It is a raw material for making tapes, hoses, and rubber shoes. It is also suitable for making shock-absorbing parts and products used in liquids containing hydroxyl radicals such as automobile brake fluid and ethanol.

　　Styrene Butadiene

　　Copolyme SBR (Styrene Butadiene Copolyme) is a copolymer of butadiene and styrene. Compared with natural rubber, it has uniform quality and less foreign matter, but its mechanical strength is weaker, so it can be blended with natural rubber.

　　Butyl Rubber IIR

　　Butyl Rubber (Butyl Rubber) is the polymerization of isobutylene and a small amount of isoprenes. It retains a small amount of unsaturated groups for vulcanization. Because the methyl group has less steric hindrance to the movement of molecules than other polymers, gas can permeate It has less resistance to heat, sunlight, and ozone, and has good electrical insulation. It has great resistance to polar solvents such as alcohols, ketones, and esters. The general operating temperature range is -54~110°C.

　　Hydrogenated nitrile rubber HNBR

　　Hydrogenated nitrile rubber (Hydrogenate Nitrile) is nitrile rubber that has been hydrogenated to remove some of its double chains. After hydrogenation, its temperature resistance and weather resistance are much higher than ordinary nitrile rubber, and its oil resistance is the same as that of ordinary nitrile rubber. Nitrile glue is similar. The general operating temperature range is -25~150 ℃.

　　EPDM Ethylene

　　propylene Rubber (Ethylene propylene Rubber) is made from the copolymerization of ethylene and propylene. The main chain is not double-chained, so it has heat resistance, aging resistance, and ozone resistance, but it cannot be vulcanized with sulfur. The general operating temperature range is -50~150 ℃. It has good resistance to polar solvents such as alcohol, ketone, ethylene glycol and phosphate ester hydraulic oil .

　　Nitrile Rubber NBR

　　Nitrile Rubber is copolymerized by acrylonitrile and butadiene. The acrylonitrile content ranges from 18% to 50%. The higher the acrylonitrile content, the more resistant it is to petrochemical oils and hydrocarbon fuel oils. The better, the better, but the low-temperature performance becomes worse. The general operating temperature range is -25~100 ℃. Nitrile rubber is one of the more commonly used rubbers for oil seals and O-rings.

　　Neoprene CR

　　Neoprene (Neoprene, Polychloroprene) is polymerized from chloroprene monomer. The vulcanized rubber has good elasticity and wear resistance, is not afraid of direct sunlight, has good atmospheric aging resistance, is not afraid of severe distortion, is not afraid of refrigerants such as dichlorodifluoromethane and ammonia, and is resistant to dilute acids and silicone esters. Lubricating oil, but not resistant to phosphate ester hydraulic oil. It is easy to crystallize and harden at low temperatures, has poor storage stability, and expands greatly in mineral oil with a low aniline point. The general operating temperature range is -50~150 ℃.

　　Chlorosulfonated polyethylene rubber

　　has good heat resistance, weather resistance, and ozone resistance. It also has good acid resistance and is often used in oxidation-resistant drugs (nitric acid, sulfuric acid). Where, the general operating temperature range is -45~120 ℃.

　　Acrylic Rubber ACM

　　Acrylic Rubber (Polyacrylate Rubber) is an elastomer polymerized from Alkyl Ester Acrylate as the main component. It has good resistance to petrochemical oil, high temperature resistance and weather resistance. It has better mechanical strength, compression deformation rate and water resistance. Weak, slightly worse than ordinary oil-resistant glue. The general operating temperature range is -25~170 ℃.

　　Polyurethane Rubber PU

　　polyurethane rubber (Urethane Rubber) has very good mechanical properties. Its high hardness, high elasticity and wear resistance are difficult to compare with other rubber types. It also has very good aging resistance, ozone resistance and oil resistance. The general operating temperature range is -45~90 ℃ .